# What is finite element analysis and how many types are used in analysis and design of concrete structures

Saad Iqbal | 🗓️Modified: April 11, 2014 | ⏳Read Time: 4 min | 👁Post Views: 229
Advancements in the field of computer aided engineering during the last two decades have been quite extensive and have led to considerable benefits to many engineering industries. Similarly the advantages can also be observed in the building industry where the softwares and tools which uses finite element have allowed the introduction of innovative and efficient building products along with development of accurate design methods.

 Finite Element Analysis

### Definition of Finite Element Analysis

According to one definition;
Finite element method (FEM) is a technique for numerical solution of complex structural problems. In this method the structural system (consisting of all the elements which make up a structure) is modeled by a set of appropriate finite elements which are interconnected at points called nodes. Elements may have physical properties such as thickness, coefficient of thermal expansion, density, compressive strength, yield strength, young’s modulus, shear modulus and Poisson’s ratio.

### Use of FEM

Traditionally, engineers have used laboratory testing to investigate the structural behavior of steel building products and systems subject to the expected wind and earthquake loads and to develop appropriate design rules. Laboratory testing was also used to develop new building products and systems. However, such reliance on time consuming and expensive laboratory testing has hindered progress in this area. The product manufacturers and designers often decided on conservative designs in order to avoid expensive and time consuming laboratory testing. However, advances in the field of computer aided engineering during the last two decades have changed this situation significantly in many engineering industries.

The finite element method (FEM) is the dominant discretization technique in structural mechanics. The basic concept in the physical interpretation of the FEM is the subdivision of the mathematical model into disjoint (non-overlapping) components of simple geometry called finite elements or elements for short. The response of each element is expressed in terms of a finite number of degrees of freedom characterized as the value of an unknown function, or functions, at a set of nodal points.

The response of the mathematical model is then considered to be approximated by that of the discrete model obtained by connecting or assembling the collection of all elements. The disconnection-assembly concept occurs naturally when examining many artificial and natural systems. For example, it is easy to visualize an engine, bridge, building, airplane, or skeleton as fabricated from simpler components. Unlike finite difference models, finite elements do not overlap in space.

A typical finite element analysis on a software system requires the following information:
1. Nodal point spatial locations (geometry)
2. Elements connecting the nodal points
3. Mass properties
4. Boundary conditions or restraints
6. Analysis options

Because FEM is a discretization method, the number of degrees of freedom of a FEM model is necessarily finite. They are collected in a column vector called u. This vector is generally called the DOF vector or state vector. The term nodal displacement vector for u is reserved to mechanical applications.
FEM Solution Process

### Procedure

1. Divide structure into pieces (elements with nodes) (discretization/meshing)
2. Connect (assemble) the elements at the nodes to form an approximate system of equations for the whole structure (forming element matrices)
3. Solve the system of equations involving unknown quantities at the nodes (e.g., displacements)
4. Calculate desired quantities (e.g., strains and stresses) at selected elements